Attachment Brush Coupling for Low-Wear Electrical Toothbrush Heads

Solution Overview

Problem

Conventional electrical care and cleaning brushes, such as toothbrushes, have a complex design with many individual parts, leading to increased wear and high manufacturing costs, and often require frequent replacement of attachment brush parts due to wear and hygiene concerns.

Innovation Solution

A multi-part attachment brush part for electrical toothbrushes is designed with a simplified structure, featuring a drive rod, brush head, and securing elements, which minimizes parts and reduces wear, while allowing for easy assembly and compatibility with different models through adjustable coupling mechanisms.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If conventional electrical care brushes use multiple individual parts for the attachment brush, then the device can be disassembled for cleaning and replacement, but the complexity of the device increases and manufacturing costs rise

Engineering Contradiction:

ImprovecleanabilityVSAvoidnumber of parts

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The attachment brush is divided into multiple separable parts including a brush head, drive rod, and securing element. These segments can be easily detached from each other, allowing the brush head to be removed for cleaning or replacement without affecting the motor housing. The segmentation enables independent maintenance of different components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The motor housing is designed with a universal coupling mechanism that can accommodate different types of attachment brushes through a standardized interface. The coupling nub and receiver design allows the same motor housing to work with various brush heads, making the system multi-functional and adaptable to different cleaning needs.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If conventional electrical care brushes use multiple individual parts, then parts can be replaced for hygiene reasons, but wear increases and service life decreases

Engineering Contradiction:

ImprovereplaceabilityVSAvoidservice life

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The securing element is pre-designed with a quick-release mechanism that allows users to easily detach and replace the brush head without tools. The coupling nub and receiver are pre-configured with alignment features and retaining structures that ensure proper assembly and secure connection, reducing the risk of improper installation that could lead to premature wear.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The coupling mechanism includes built-in wear compensation features and protective elements that cushion against misalignment and excessive forces during assembly and disassembly. The design anticipates repeated attachment and detachment cycles, incorporating features that protect against wear and damage to the coupling components.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Adaptability or versatility

If conventional electrical care brushes are designed with complex multi-part structures, then functionality is enhanced, but manufacturing costs increase

Engineering Contradiction:

ImprovefunctionalityVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The attachment brush is divided into multiple separable parts including a brush head, drive rod, and securing element. These segments can be easily detached from each other, allowing the brush head to be removed for cleaning or replacement without affecting the motor housing. The segmentation enables independent maintenance of different components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The motor housing is designed with a universal coupling mechanism that can accommodate different types of attachment brushes through a standardized interface. The coupling nub and receiver design allows the same motor housing to work with various brush heads, making the system multi-functional and adaptable to different cleaning needs.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution enhances durability, reduces energy consumption, and lowers noise levels while maintaining effective cleaning performance, offering a cost-effective and reliable solution with improved bristle fields for enhanced cleaning efficacy.

Implementation Method 1

the brush head is brought into movement via an electromotoric drive

Methodology Applied

Scientific EffectElectromotoric drive: Electromagnetic Induction

Implementation Method 2

the hand part as a rule additionally comprises a gear for converting the rotation movement of the electromotoric drive into an oscillating rotation movement of the control pin

Methodology Applied

Scientific EffectGear mechanism: Gear

Implementation Method 3

A control pin which projects out of the coupling nub at the end side and serves for transmitting mechanical drive energy into the attachment brush part

Methodology Applied

Scientific EffectMechanical coupling: Mechanical Force

Data Source

PatentUS12575919B2Electrical body care brush

Publication Date: 2026.03.17 TRISA HLDG AG

AI summary

An attachment brush part for an electrical body care brush, in particular an electrical toothbrush, includes brush head with an in particular circular bristle carrier, on which a bristle field with a plurality of bristle bundles each with a plurality of care bristles is arranged.